Avidemux to trim commercials: output has shorter audio stream than video

[MGRV]

I'm trying to cut the commercials out of a TV broadcast using Avidemux, but I've encountered this problem in my first tests: the audio cuts off at the point of my first edit. For some reason, the resulting file's audio stream ends at the point of my first trim point, after which there's only video. I'm providing the MediaInfo data for both files, so maybe some of the knowledgeable people here can point out what the problem might be. I can only point out that for some reason my edit shows "Source duration" in its info, and also the compression has been changed from constant to variable. I have no idea what that is about. By the way, I'm only using keyframes as edit points to avoid any problems, but after the first failed attempts I also tried other alternatives, with similar results. I'm using the Copy option for both video and audio.

Original:

General
Complete name                  : C:\Users\Matias\Videos\Original.mp4
Format                         : MPEG-4
Format profile                 : Base Media
Codec ID                       : isom (isom/iso2/avc1/mp41)
File size                      : 3.63 GiB
Duration                       : 2 h 0 min
Overall bit rate               : 4 331 kb/s
Writing application            : Lavf56.40.101

Video
ID                             : 1
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : Main@L4
Format settings                : CABAC / 3 Ref Frames
Format settings, CABAC         : Yes
Format settings, ReFrames      : 3 frames
Codec ID                       : avc1
Codec ID/Info                  : Advanced Video Coding
Duration                       : 2 h 0 min
Bit rate                       : 4 198 kb/s
Width                          : 1 280 pixels
Height                         : 720 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Variable
Frame rate                     : 29.970 (29970/1000) FPS
Minimum frame rate             : 0.508 FPS
Maximum frame rate             : 29.970 FPS
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Progressive
Bits/(Pixel*Frame)             : 0.152
Stream size                    : 3.52 GiB (97%)
Codec configuration box        : avcC

Audio
ID                             : 2
Format                         : AAC LC
Format/Info                    : Advanced Audio Codec Low Complexity
Codec ID                       : mp4a-40-2
Duration                       : 2 h 0 min
Bit rate mode                  : Constant
Bit rate                       : 126 kb/s
Channel(s)                     : 2 channels
Channel layout                 : L R
Sampling rate                  : 44.1 kHz
Frame rate                     : 43.066 FPS (1024 SPF)
Compression mode               : Lossy
Stream size                    : 108 MiB (3%)
Default                        : Yes
Alternate group                : 1

Edit: (notice the shorter length for the audio stream)

General
Complete name                  : C:\Users\Matias\Videos\Edit.mp4
Format                         : MPEG-4
Format profile                 : Base Media / Version 2
Codec ID                       : mp42 (mp42/isom)
File size                      : 1 014 MiB
Duration                       : 32 min 34 s
Overall bit rate mode          : Variable
Overall bit rate               : 4 351 kb/s
Encoded date                   : UTC 2019-02-11 04:00:20
Tagged date                    : UTC 2019-02-11 04:01:14

Video
ID                             : 1
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : Main@L4
Format settings                : CABAC / 3 Ref Frames
Format settings, CABAC         : Yes
Format settings, ReFrames      : 3 frames
Codec ID                       : avc1
Codec ID/Info                  : Advanced Video Coding
Duration                       : 32 min 34 s
Bit rate                       : 4 245 kb/s
Width                          : 1 280 pixels
Height                         : 720 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Variable
Frame rate                     : 29.970 (29970/1000) FPS
Minimum frame rate             : 29.004 FPS
Maximum frame rate             : 29.980 FPS
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Progressive
Bits/(Pixel*Frame)             : 0.154
Stream size                    : 989 MiB (98%)
Encoded date                   : UTC 2019-02-11 04:00:20
Tagged date                    : UTC 2019-02-11 04:01:14
Codec configuration box        : avcC

Audio
ID                             : 2
Format                         : AAC LC
Format/Info                    : Advanced Audio Codec Low Complexity
Codec ID                       : mp4a-40-2
Duration                       : 26 min 6 s
Source duration                : 26 min 6 s
Bit rate mode                  : Variable
Bit rate                       : 126 kb/s
Channel(s)                     : 2 channels
Channel layout                 : L R
Sampling rate                  : 44.1 kHz
Frame rate                     : 43.066 FPS (1024 SPF)
Compression mode               : Lossy
Stream size                    : 23.5 MiB (2%)
Source stream size             : 23.5 MiB (2%)
Title                          : Stereo
Encoded date                   : UTC 2019-02-11 04:00:20
Tagged date                    : UTC 2019-02-11 04:01:04

Any help will be greatly appreciated.

[poisondeathray]

You can't really edit VFR video (or only with extreme difficulty, and not with avidemux because it involves timecode editing) ; you usually have to convert it to CFR before editing

Frame rate mode : Variable
Frame rate : 29.970 (29970/1000) FPS
Minimum frame rate : 0.508 FPS
Maximum frame rate : 29.970 FPS

If it's a TV broadcast , you should be recording in CFR mode

[MGRV]

You can't really edit VFR video (or only with extreme difficulty, and not with avidemux because it involves timecode editing) ; you usually have to convert it to CFR before editing

Can that be done without re-encoding? Sorry if it's a dumb question and thanks for your reply!

[poisondeathray]

You can't really edit VFR video (or only with extreme difficulty, and not with avidemux because it involves timecode editing) ; you usually have to convert it to CFR before editing

Can that be done without re-encoding? Sorry if it's a dumb question and thanks for your reply!

Not really, or with extreme difficulty taking account of timecodes for different sections.

If you re-encode it to make it CFR (basically inserting duplicate frames where your dropped frames were), then you could edit it "normally", but that involves at least one or more re-encoding steps.

[MGRV]

Thanks for your reply. I guess the only solution would be something like the 'smart editing' some pieces of software do. I'll live with fast-forwarding on commercials!

[poisondeathray]

Thanks for your reply. I guess the only solution would be something like the 'smart editing' some pieces of software do. I'll live with fast-forwarding on commercials!

They can't handle VFR properly either.

Very difficult to edit as VFR